modify readme, add usage gif

StardustDL · StardustDL · commit efa9620612ed · 2018-04-16T15:04:02.000+08:00
diff --git a/README.md b/README.md
@@ -20,8 +20,14 @@
 
 # Usage
 
+![](http://osyor26xu.bkt.clouddn.com/reCLI.gif)
+
+See [wiki](https://github.com/StardustDL/reCLI/wiki)
+
 ## Install
 
+Download at release page and unzip the file, then execute `reCLI.exe`.
+
 # Dependencies
 
 - .NET Standard 2.0
